| Titre : |
The formation and corrosion behavior of a zirconium-based conversion coating on the aluminum alloy AA6061 |
| Type de document : |
texte imprimé |
| Auteurs : |
Dongdong Peng, Auteur ; Junsheng Wu, Auteur ; Xiaoli Yan, Auteur ; Xiaoqiong Du, Auteur ; Yueying Yan, Auteur ; Xiaogang Li, Auteur |
| Année de publication : |
2016 |
| Article en page(s) : |
p. 837-850 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Aluminium -- Alliages
Anticorrosion
Corrosion par piqure
Electrochimie
Essais accélérés (technologie)
Métaux -- Revêtements protecteurs
Revêtement métallique
Zirconium
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
To understand the mechanism of the coating formation, the formation process of a zirconium-based conversion coating on aluminum alloy 6061 has been studied by means of AFM in PeakForce Kelvin Probe Force Microscope (PF-KPFM) mode which could provide direct evidence for the existence of driving force for the film formation. In addition, various techniques including SEM, XPS, EIS, salt spray test, and scanning electrochemical microscope were used to investigate the surface state and corrosion behavior of the conversion film. The direct driving force for the coating formation is the Volta potential difference between the intermetallic particles and matrix. That difference produces an ocean of micro electrochemical cells in which the intermetallic particles act as cathodic sites for the film deposition. However, the precipitation of the layer is a self-limited process in which the driving force gradually decreases as the conversion layer covers the surface of the aluminum alloys. The anti-corrosion performance of the film is unfavorable compared to the conventional chromate conversion coatings due to the pitting corrosion that occurs when exposed to harsh environment containing chloride. Furthermore, the zirconium-based conversion coating possesses no self-healing ability leading to the continuous degradation of the film until it completely lose efficacy. |
| Note de contenu : |
- EXPERIMENTAL : Materials and surface pre-treatment - Surface characterization - Electrochemical measurements - Salt spray test - Scanning electrochemical measurement
- RESULTS AND DISCUSSION : The formation process of the conversion - Optimization of practical parameters for better corrosion-resistant properties of the conversion coating - Corrosion behavior of the conversion film fabricated in optimal practical parameters |
| DOI : |
10.1007/s11998-016-9789-1 |
| En ligne : |
http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9789-1.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27123 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 837-850
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